OK look you have to be SPECIFIC. What exactly is your test setup, EXACTLY. Do you have power jumpered to the coil +? Or are you using the key "twist to start?" Or are you jumpering the starter solenoid to get it to crank?
What did you use for a coil wire and gap in the test. What did the spark look like? How big/ how long, and are you using a SOLID WIRE as I suggested?
In other words, do you have "just a spark" or do you have a nice strong fat spark?
As someone suggested, If you ACTUALLY have a really good hot spark, at the coil, and FOR SURE none at the plugs, then a bad rotor, cap, or coil wire might be the cause.
BEAR IN MIND that the distributor moves at 1/2 crank speed so make certain you crank it long enough that it actually "came around" to whatever plug you are checking.
If it might be rotor, or you don't no, NOW try to eliminate a PLUG or WIRE(s) as the problem. Take and rig a test gap and SOLID wire to a plug tower and re-test.